U.S. patent application number 13/980319 was filed with the patent office on 2013-11-14 for mobile terminal apparatus, base station apparatus and communication control method.
This patent application is currently assigned to NTT DOCOMO, INC.. The applicant listed for this patent is Yoshihisa Kishiyama. Invention is credited to Yoshihisa Kishiyama.
Application Number | 20130301486 13/980319 |
Document ID | / |
Family ID | 46672716 |
Filed Date | 2013-11-14 |
United States Patent
Application |
20130301486 |
Kind Code |
A1 |
Kishiyama; Yoshihisa |
November 14, 2013 |
MOBILE TERMINAL APPARATUS, BASE STATION APPARATUS AND COMMUNICATION
CONTROL METHOD
Abstract
To optimize operation of a mobile terminal apparatus when a
Half-duplex FDD scheme is applied, the mobile terminal apparatus
performs radio communications with a base station apparatus by
HD-FDD, and when transmission timing of an uplink signal and
reception timing of a downlink signal overlaps each other,
selectively performs transmission processing of the uplink signal
and reception processing of the downlink signal, based on a
priority relationship defined between the uplink signal and the
downlink signal.
Inventors: |
Kishiyama; Yoshihisa;
(Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kishiyama; Yoshihisa |
Tokyo |
|
JP |
|
|
Assignee: |
NTT DOCOMO, INC.
Tokyo
JP
|
Family ID: |
46672716 |
Appl. No.: |
13/980319 |
Filed: |
February 17, 2012 |
PCT Filed: |
February 17, 2012 |
PCT NO: |
PCT/JP2012/053818 |
371 Date: |
July 18, 2013 |
Current U.S.
Class: |
370/277 |
Current CPC
Class: |
H04L 5/14 20130101; H04L
5/0087 20130101; H04L 5/0042 20130101; H04L 5/1453 20130101; H04L
5/143 20130101; H04L 5/0007 20130101; H04L 5/0028 20130101; H04L
5/0092 20130101; H04L 5/16 20130101 |
Class at
Publication: |
370/277 |
International
Class: |
H04L 5/16 20060101
H04L005/16 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 18, 2011 |
JP |
2011-033388 |
Claims
1. A mobile terminal apparatus that performs radio communications
with a base station apparatus by a half-duplex scheme, comprising:
a transmission/reception section configured to transmit an uplink
signal to the base station apparatus, and receive a downlink signal
from the base station apparatus; and a control section configured
to cause the transmission/reception section to selectively perform
transmission of the uplink signal and reception of the downlink
signal, based on a priority relationship defined between the uplink
signal and the downlink signal, when transmission timing of the
uplink signal and reception timing of the downlink signal overlaps
each other.
2. The mobile terminal apparatus according to claim 1, wherein the
control section causes the transmission/reception section to
perform only processing of a higher propriety between transmission
of the uplink signal and reception of the downlink signal.
3. The mobile terminal apparatus according to claim 1, wherein when
priorities of the uplink signal and the downlink signal are the
same, the control section causes the transmission/reception section
to halt transmission and reception.
4. The mobile terminal apparatus according to claim 1, wherein the
control section causes the transmission/reception section to
perform processing of a lower propriety between transmission of the
uplink signal and reception of the downlink signal by instructions
from the base station apparatus.
5. The mobile terminal apparatus according to claim 1, wherein the
control section causes the transmission/reception section to
perform one of processing of transmission of the uplink signal and
reception of the downlink signal up to some point in a single
subframe, and then, perform the other processing in remaining
resources in the single subframe.
6. The mobile terminal apparatus according to claim 5, wherein the
control section causes the transmission/reception section to
perform reception of a downlink data signal up to some point in a
single subframe, and then, perform transmission of an uplink
reference signal in remaining resources in the single subframe.
7. The mobile terminal apparatus according to claim 1, wherein the
control section causes the transmission/reception section to
transmit an uplink signal, using a signal format of the uplink
signal defined so as to avoid a downlink signal in a single
subframe.
8. The mobile terminal apparatus according to claim 7, wherein the
control section causes the transmission/reception section to
transmit an uplink control signal, using a signal format of the
uplink control signal with first several symbols being vacant so as
to avoid a downlink L1/L2 control signal in a single subframe.
9. The mobile terminal apparatus according to claim 7, wherein the
control section causes the transmission/reception section to
transmit an uplink synchronization signal, using a signal format of
the uplink synchronization signal with first several symbols being
vacant so as to avoid a downlink L1/L2 control signal in a single
subframe.
10. Abase station apparatus that performs radio communications with
a mobile terminal apparatus of a half-duplex scheme, comprising: a
signal processing section configured to generate an uplink signal
corresponding to scheduling information, and performs demodulation
and decoding of a downlink signal; and a transmission/reception
section configured to receive the uplink signal from the mobile
terminal apparatus, and transmit the downlink signal to the mobile
terminal apparatus, wherein the signal processing section performs
signal processing in accordance with transmission/reception
processing that is selectively performed in the mobile terminal
apparatus based on a priority relationship defined between the
uplink signal and the downlink signal, when transmission timing of
the uplink signal and reception timing of the downlink signal
overlaps each other in the mobile terminal apparatus.
11. A communication control method in a mobile terminal apparatus
which transmits an uplink signal to a base station apparatus, and
receives a downlink signal from the base station apparatus, by a
half-duplex scheme, comprising: determining priorities of
transmission of an uplink signal and reception of a downlink signal
based on a priority relationship defined between the uplink signal
and the downlink signal, when transmission timing of the uplink
signal and reception timing of the downlink signal overlaps each
other; and performing selectively transmission of the uplink signal
and reception of the downlink signal based on the determination
result.
Description
TECHNICAL FIELD
[0001] The present invention relates to a mobile terminal
apparatus, base station apparatus and communication control method
in the next-generation mobile communication system.
BACKGROUND ART
[0002] In UMTS (Universal Mobile Telecommunications System)
networks, for the purpose of improving spectral efficiency and
further improving data rates, by adopting HSDPA (High-Speed
Downlink Packet Access) and HSUPA (High Speed Uplink Packet
Access), it is performed exploiting maximum features of the system
based on W-CDMA (Wideband Code Division Multiple Access). For the
UMTS network, for the purpose of further increasing high-speed data
rates, providing low delay and the like, Long Term Evolution (LTE)
has been studied (Non-patent Literature 1).
[0003] In the 3G system, a fixed band of 5 MHz is substantially
used, and it is possible to achieve transmission rates of
approximately maximum 2 Mbps in downlink. Meanwhile, in the LTE
system, using variable bands ranging from 1.4 MHz to 20 MHz, it is
possible to achieve transmission rates of maximum 300 Mbps in
downlink and about 75 Mbps in uplink. Further, in the UMTS network,
for the purpose of further increasing the wide-band and high speed,
successor systems to LTE have been studied (for example, also
called LTE Advanced (LTE-A) or LTE Enhancement).
[0004] In such a system, as a duplex scheme applied to radio
systems, there are a Frequency Division Duplex (FDD) scheme and
Time Division Duplex (TDD) scheme. In the FDD scheme, different
frequency bands spaced a sufficient interval are used in uplink and
downlink. In the TDD scheme, the same frequency band is used in
uplink and downlink, and uplink communications and downlink
communications are divided by time. In the FDD scheme, it is
necessary to adequately widen the interval between the frequency
bands used in uplink and downlink, and therefore, not only the base
station apparatus but also the mobile terminal apparatus require a
duplexer with high accuracy.
[0005] Further, mobile terminal apparatuses (Rel. 8 or later) of
LTE system and its successor system support also a Half-duplex FDD
scheme. In the Half-duplex FDD scheme, as in the FDD scheme,
different frequency bands are used in uplink and downlink, while
uplink communications and downlink communications are switched by
time. Therefore, mobile terminal apparatuses do not need a duplexer
with high accuracy, and it is possible to simplify the mobile
terminal apparatuses.
CITATION LIST
Non-Patent Literature
[0006] [Non-patent Literature 1] 3GPP, TR25.912(V7.1.0),
"Feasibility study for Evolved UTRA and UTRAN", September 2006
SUMMARY OF THE INVENTION
Technical Problem
[0007] However, in mobile terminal apparatuses in the case where
the Half-duplex FDD scheme is applied, optimization of operation
still remains as an issue.
[0008] The present invention was made in view of such a respect,
and it is an object of the invention to provide a mobile terminal
apparatus, base station apparatus and communication control method
that enable the Half-duplex FDD scheme to be optimized.
Solution to Problem
[0009] A mobile terminal apparatus of the invention is a mobile
terminal apparatus that performs radio communications with a base
station apparatus by a half-duplex scheme, and is characterized by
having a transmission/reception section configured to transmit an
uplink signal to the base station apparatus, and receive a downlink
signal from the base station apparatus, and a control section
configured to cause the transmission/reception section to
selectively perform transmission of the uplink signal and reception
of the downlink signal, based on a priority relationship defined
between the uplink signal and the downlink signal, when
transmission timing of the uplink signal and reception timing of
the downlink signal overlaps each other.
Technical Advantage of the Invention
[0010] According to the invention, in the mobile terminal
apparatus, when transmission timing of the uplink signal and
reception timing of the downlink signal overlaps each other,
transmission and reception processing is selectively performed.
Accordingly, it is possible to cause the mobile terminal apparatus
to which the half-duplex scheme is applied to perform optimal
operation when transmission timing of the uplink signal and
reception timing of the downlink signal overlaps each other.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is an explanatory view of a system band of an LTE
system;
[0012] FIG. 2 is an explanatory view of a Half-duplex FDD
scheme;
[0013] FIG. 3 contains operation explanatory views of a mobile
terminal apparatus when uplink transmission timing and downlink
reception timing overlaps each other;
[0014] FIG. 4 is a table showing an example of a priority
relationship between uplink signals and downlink signals;
[0015] FIG. 5 contains explanatory views of transmission/reception
methods of uplink signal and downlink signal in the same
subframe;
[0016] FIG. 6 is an explanatory view of a system configuration of a
radio communication system;
[0017] FIG. 7 is an entire configuration diagram of a base station
apparatus;
[0018] FIG. 8 is an entire configuration diagram of the mobile
terminal apparatus;
[0019] FIG. 9 is a functional block diagram of the base station
apparatus; and
[0020] FIG. 10 is a functional block diagram of the mobile terminal
apparatus.
DESCRIPTION OF EMBODIMENTS
[0021] FIG. 1 is a diagram to explain a frequency usage state when
mobile communications are performed in downlink. In addition, in
all figures to explain the Embodiment, components having the same
functions are assigned the same reference numerals to omit
redundant descriptions. The example as shown in FIG. 1 is of the
frequency usage state in the case of coexistence of LTE-A systems
that are first communication systems having first relatively wide
system bands comprised of a plurality of component carriers, and
LTE systems that are second communication systems having a second
relatively narrow system band (herein, comprised of a single
component carrier). In the LTE-A systems, for example, radio
communications are performed with a variable system bandwidth of
100 MHz or less, and in the LTE systems, radio communications are
performed with a variable system bandwidth of 20 MHz or less. The
system band of the LTE-A system is at least one base frequency
region (component carrier: CC) with a system band of the LTE system
as a unit. Thus integrating a plurality of base frequency regions
to broaden the band is referred to as carrier aggregation.
[0022] For example, in FIG. 1, the system band of the LTE-A system
is a system band (20 MHz.times.5=100 MHz) containing bands of five
component carriers where the system band (base band: 20 MHz) of the
LTE system is one component carrier. In FIG. 1, a mobile terminal
apparatus UE (User Equipment) #1 is a mobile terminal apparatus
supporting the LTE-A system (also supporting the LTE system), and
has the system band of 100 MHz, UE#2 is a mobile terminal apparatus
supporting the LTE-A system (also supporting the LTE system), and
has the system band of 40 MHz (20 MHz.times.2=40 MHz), and UE#3 is
a mobile terminal apparatus supporting the LTE system (not
supporting the LTE-A system), and has the system band of 20 MHz
(base band).
[0023] In addition, mobile terminal apparatus UEs of LTE system
(Rel. 8) and its successor system (LTE-A system) support a
Half-duplex FDD scheme (hereinafter, referred to as HD-FDD) as a
duplex scheme. In HD-FDD, as shown in FIG. 2, uplink
transmission/reception and downlink transmission/reception of a
mobile terminal apparatus UE is divided both in frequency and time.
Accordingly, the mobile terminal apparatus does simultaneously not
perform uplink transmission and downlink reception.
[0024] In this case, in switching from downlink to uplink, the
mobile terminal apparatus gives priority to transmitting an uplink
subframe from the beginning, and ignores an end portion of a
downlink subframe. Meanwhile, in switching from uplink to downlink,
the mobile terminal apparatus controls uplink transmission timing
to reserve a time to switch to downlink. However, such an operation
of the mobile terminal apparatus is dependent on scheduling of the
base station apparatus, and when uplink transmission and downlink
reception occurs at the same time, there is a problem that the
mobile terminal apparatus is not able to operate properly.
[0025] Therefore, the inventors of the present invention arrived at
the invention to solve the problems. In other words, it is the gist
of the invention to cause a mobile terminal apparatus to perform
transmission/reception based on a priority relationship between an
uplink signal and a downlink signal when uplink transmission timing
and downlink reception timing overlaps each other in the mobile
terminal apparatus. By this means, it is possible to optimize the
operation of the mobile terminal apparatus to which is applied
HD-FDD.
[0026] Herein, described is the operation of the mobile terminal
apparatus when uplink transmission timing and downlink reception
timing overlaps each other. FIG. 3 contains operation explanatory
views of the mobile terminal apparatus when uplink transmission
timing and downlink reception timing overlaps each other.
[0027] When uplink transmission timing and downlink reception
timing overlaps each other in a mobile terminal apparatus, the
mobile terminal apparatus performs following four patterns of
operation corresponding to the priority relationship between an
uplink signal and a downlink signal. In a first pattern as shown in
FIG. 3A, the mobile terminal apparatus gives a higher priority to
transmission processing of an uplink signal than reception
processing of a downlink signal. For example, when the uplink
signal is more important (has a higher priority) than the downlink
signal, the mobile terminal apparatus gives priority to
transmission processing of the uplink signal. In addition, the
mobile terminal apparatus does always not give priority to
transmission processing of an uplink signal every time, and is
capable of giving priority to reception processing of a downlink
signal in a particular subframe corresponding to instructions from
a base station apparatus.
[0028] In a second pattern as shown in FIG. 3B, the mobile terminal
apparatus gives a higher priority to reception processing of a
downlink signal than transmission processing of an uplink signal.
For example, when the downlink signal is more important (has a
higher priority) than the uplink signal, the mobile terminal
apparatus gives priority to reception processing of the downlink
signal. In addition, the mobile terminal apparatus does always not
give priority to reception processing of a downlink signal every
time, and is capable of giving priority to transmission processing
of an uplink signal in a particular subframe corresponding to
instructions from a base station apparatus.
[0029] Ina third pattern as shown in FIG. 3C, the mobile terminal
apparatus performs both transmission processing of an uplink signal
and reception processing of a downlink signal in a single subframe.
For example, the mobile terminal apparatus gives priority to
reception processing of the downlink signal up to some point of a
subframe, while giving priority to transmission processing of the
uplink signal in remaining symbols. In this case, by using a PUCCH
format for HD-FDD or PRACH format for HD-FDD as described later,
the mobile terminal apparatus may perform transmission processing
of an uplink signal and reception processing of a downlink signal
in the same subframe.
[0030] In a fourth pattern as shown in FIG. 3D, the mobile terminal
apparatus performs neither transmission processing of an uplink
signal nor reception processing of a downlink signal. For example,
when the uplink signal and downlink signal are both important
(priorities are the same), the mobile terminal apparatus regards as
erroneous detection of signals, and halts transmission/reception
processing of the downlink signal and uplink signal.
[0031] Described next is the priority relationship between uplink
signals and downlink signals. FIG. 4 is a table showing an example
of the priority relationship between uplink signals and downlink
signals. In addition, the priority relationship and kinds of
signals as shown in FIG. 4 are not limited thereto, and are capable
of being modified as appropriate.
[0032] Herein, as uplink signals, exemplified are a PUSCH signal,
Periodic CQI (Channel Quality Indicator), ACK
(Acknowledgement)/NACK (Negative Acknowledgement), Positive SR
(Scheduling Request), SRS (Sounding Reference Signal), and PRACH
signal. The PUSCH signal is transmitted on a PUSCH (Physical Uplink
Shared Channel) as an uplink data channel shared among a plurality
of mobile terminals, and includes user data and control information
of higher layer. The Periodic CQI is transmitted on a PUCCH
(Physical Uplink Control Channel) as an uplink control channel, and
is channel quality information of downlink required for scheduling
of downlink user data and adaptive link control.
[0033] The ACK/NACK is response information to a PDSCH transmitted
on the PUCCH. The Positive SR is transmitted on the PUCCH, and
request information for requesting a base station apparatus to add
to scheduling in order for the mobile terminal apparatus to
transmit newly occurring data. The SRS is a reference signal used
for measurement of a CQI of uplink for each frequency of the mobile
terminal apparatus. The PRACH signal is transmitted on a PRACH
(Physical Random Access Channel) as an access channel, and is a
collision type signal for the mobile terminal apparatus to perform
setting of a communication start and the like in initial
access.
[0034] Further, herein, as downlink signals, exemplified are a
PDSCH signal, PDCCH signal, PHICH signal, CSI-RS (Channel State
Information--Reference Signal), and PBCH signal. The PDSCH signal
is transmitted on a PDSCH (Physical Downlink Shared Channel) as a
downlink data channel shared among mobile terminal apparatuses, and
includes user data and control information of higher layer. The
PDCCH signal is transmitted on a PDCCH (Physical Downlink Control
Channel) as a downlink control channel, and includes scheduling
information of the PUSCH and PDCCH by a scheduler and the like.
[0035] The PHICH signal is transmitted on a PHICH (Physical HARQ
Indicator Channel) as a downlink control channel, and is ACK/NACK
(response information) to the PUSCH. The CSI-RS is a reference
signal used in CSI measurement for CQI, PMI (Precoding Matrix
Indicator), RI (Rank Indicator) and the like as a channel state.
The PBCH signal is transmitted on a PBCH (Physical Broadcast
Channel) as a broadcast channel, and includes system-specific and
cell-specific control information broadcasted to the entire
cell.
[0036] The priority relationship between each uplink signal and
each downlink signal described above will be described below. The
priority relationship is set on both the mobile terminal apparatus
and the base station apparatus, is used by the mobile terminal
apparatus in selection of transmission/reception processing, and is
used by the base station apparatus mainly in demodulation of an
uplink signal from the mobile terminal apparatus.
[0037] As shown in FIG. 4, the priority of a PUSCH signal in uplink
is defined to be the same as the priority of a PDSCH signal in
downlink. Accordingly, when transmission timing of the PUSCH signal
and reception timing of the PDSCH signal overlaps each other, the
mobile terminal apparatus neither transmits nor receives any of the
signals, and regards as erroneous detection of signals.
[0038] The priority of a PUSCH signal in uplink is defined to be
higher than the priority of a PDCCH signal in downlink.
Accordingly, when transmission timing of the PUSCH signal and
reception timing of the PDCCH signal overlaps each other, the
mobile terminal apparatus transmits the PUSCH signal. In addition,
the mobile terminal apparatus may give a higher priority to
reception of the PDCCH signal than transmission of the PUSCH signal
in a particular subframe. The particular subframe may be notified
semi-statically from the base station apparatus to the mobile
terminal apparatus by RRC signaling or the like, or may be notified
dynamically from the base station apparatus to the mobile terminal
apparatus by adding a control bit of the PDCCH signal.
[0039] The priority of a PUSCH signal in uplink is defined to be
lower than the priority of a PHICH signal in downlink. Accordingly,
when transmission timing of the PUSCH signal and reception timing
of the PHICH signal overlaps each other, the mobile terminal
apparatus receives the PHICH signal.
[0040] The priority of a PUSCH signal in uplink is defined to be
higher than the priority of a CSI-RS in downlink. Accordingly, when
transmission timing of the PUSCH signal and reception timing of the
CSI-RS overlaps each other, the mobile terminal apparatus transmits
the PUSCH signal.
[0041] The priority of a PUSCH signal in uplink is defined to be
higher than the priority of a PBCH signal in downlink. Accordingly,
when transmission timing of the PUSCH signal and reception timing
of the PBCH signal overlaps each other, the mobile terminal
apparatus transmits the PUSCH signal. In addition, the mobile
terminal apparatus may give a higher priority to reception of the
PBCH signal than transmission of the PUSCH signal in a particular
subframe. The particular subframe may be notified by RRC signaling
or the like, or may be notified by adding a control bit of the
PDCCH signal.
[0042] The priority of a Periodic CQI in uplink is defined to be
higher than the priority of a PDSCH signal in downlink.
Accordingly, when transmission timing of the Periodic CQI and
reception timing of the PDSCH signal overlaps each other, the
mobile terminal apparatus transmits the Periodic CQI.
[0043] The priority of a Periodic CQI in uplink is defined to be
higher than the priority of a PDCCH signal in downlink.
Accordingly, when transmission timing of the Periodic CQI and
reception timing of the PDCCH signal overlaps each other, the
mobile terminal apparatus transmits the Periodic CQI. In addition,
the mobile terminal apparatus may perform transmission of the
Periodic CQI and reception of the PDCCH signal in the same
subframe, using a PUCCH format for HD-FDD. The PUCCH format for
HD-FDD will specifically be described later.
[0044] The priority of a Periodic CQI in uplink is defined to be
lower than the priority of a PHICH signal in downlink. Accordingly,
when transmission timing of the Periodic CQI and reception timing
of the PHICH signal overlaps each other, the mobile terminal
apparatus receives the PHICH. In addition, the mobile terminal
apparatus may perform transmission of the Periodic CQI and
reception of the PHICH signal in the same subframe, using the PUCCH
format for HD-FDD.
[0045] The priority of a Periodic CQI in uplink is defined to be
higher than the priority of a CSI-RS in downlink. Accordingly, when
transmission timing of the Periodic CQI and reception timing of the
CSI-RS overlaps each other, the mobile terminal apparatus transmits
the Periodic CQI. In addition, the mobile terminal apparatus may
give a higher priority to reception of the CSI-RS than transmission
of the Periodic CQI in a particular subframe. The particular
subframe may be notified by RRC signaling or the like, or may be
notified by adding a control bit to the PDCCH signal.
[0046] The priority of a Periodic CQI in uplink is defined to be
higher than the priority of a PBCH signal in downlink. Accordingly,
when transmission timing of the Periodic CQI and reception timing
of the PBCH signal overlaps each other, the mobile terminal
apparatus transmits the Periodic CQI. In addition, the mobile
terminal apparatus may give a higher priority to reception of the
PBCH signal than transmission of the Periodic CQI in a particular
subframe. The particular subframe may be notified by RRC signaling
or the like, or may be notified by adding a control bit to the
PDCCH signal.
[0047] The priority of ACK/NACK in uplink is defined to be higher
than the priority of a PDSCH signal in downlink. Accordingly, when
transmission timing of ACK/NACK and reception timing of the PDSCH
signal overlaps each other, the mobile terminal apparatus transmits
ACK/NACK.
[0048] The priority of ACK/NACK in uplink is defined to be higher
than the priority of a PDCCH signal in downlink. Accordingly, when
transmission timing of ACK/NACK and reception timing of the PDCCH
signal overlaps each other, the mobile terminal apparatus transmits
ACK/NACK. In addition, the mobile terminal apparatus may perform
transmission of ACK/NACK and reception of the PDCCH signal in the
same subframe, using the PUCCH format for HD-FDD.
[0049] The priority of ACK/NACK in uplink is defined to be the same
as the priority of a PHICH signal in downlink. Accordingly, when
transmission timing of ACK/NACK and reception timing of the PHICH
signal overlaps each other, the mobile terminal apparatus neither
transmits nor receives any of the signals, and regards as erroneous
detection of signals.
[0050] The priority of ACK/NACK in uplink is defined to be higher
than the priority of a CSI-RS in downlink. Accordingly, when
transmission timing of ACK/NACK and reception timing of the CSI-RS
overlaps each other, the mobile terminal apparatus transmits
ACK/NACK.
[0051] The priority of ACK/NACK in uplink is defined to be higher
than the priority of a PBCH signal in downlink. Accordingly, when
transmission timing of ACK/NACK and reception timing of the PBCH
signal overlaps each other, the mobile terminal apparatus transmits
ACK/NACK.
[0052] The priority of a Positive SR in uplink is defined to be
lower than the priority of a PDSCH signal in downlink. Accordingly,
when transmission timing of the Positive SR and reception timing of
the PDSCH signal overlaps each other, the mobile terminal apparatus
receives the PDSCH signal.
[0053] The priority of a Positive SR in uplink is defined to be
higher than the priority of a PDCCH signal in downlink.
Accordingly, when transmission timing of the Positive SR and
reception timing of the PDCCH signal overlaps each other, the
mobile terminal apparatus transmits the Positive SR. In addition,
the mobile terminal apparatus may perform transmission of the
Positive SR and reception of the PDCCH signal in the same subframe,
using the PUCCH format for HD-FDD.
[0054] The priority of a Positive SR in uplink is defined to be
lower than the priority of a PHICH signal in downlink. Accordingly,
when transmission timing of the Positive SR and reception timing of
the PHICH signal overlaps each other, the mobile terminal apparatus
receives the PHICH signal. In addition, the mobile terminal
apparatus may perform transmission of the Positive SR and reception
of the PHICH signal in the same subframe, using the PUCCH format
for HD-FDD.
[0055] The priority of a Positive SR in uplink is defined to be
higher than the priority of a CSI-RS in downlink. Accordingly, when
transmission timing of the Positive SR and reception timing of the
CSI-RS overlaps each other, the mobile terminal apparatus transmits
the Positive SR.
[0056] The priority of a Positive SR in uplink is defined to be
higher than the priority of a PBCH signal in downlink. Accordingly,
when transmission timing of the Positive SR and reception timing of
the PBCH signal overlaps each other, the mobile terminal apparatus
transmits the Positive SR. In addition, the mobile terminal
apparatus may give a higher priority to reception of the PBCH
signal than transmission of the Positive SR in a particular
subframe. The particular subframe may be notified by RRC signaling
or the like, or may be notified by adding a control bit to the
PDCCH signal.
[0057] The priority of an SRS in uplink is defined to be higher
than the priority of a PDSCH signal in downlink. Accordingly, when
transmission timing of the SRS and reception timing of the PDSCH
signal overlaps each other, the mobile terminal apparatus transmits
the SRS. In addition, although details will be described later, the
base station apparatus may transmit the SRS in uplink after
receiving the PDSCH signal up to some point in downlink.
[0058] An SRS in uplink is assigned to a different symbol from that
of a PDCCH signal in downlink in the same subframe. Accordingly,
transmission of the SRS and reception of the PDCCH is performed in
the same subframe. In addition, priories may be defined or may not
be defined between an SRS and a PDCCH signal.
[0059] An SRS in uplink is assigned to a different symbol from that
of a PHICH signal in downlink in the same subframe. Accordingly,
transmission of the SRS and reception of the PHICH is performed in
the same subframe. In addition, priories may be defined or may not
be defined between an SRS and a PHICH signal.
[0060] When an SRS in uplink is assigned to a different symbol from
that of a CSI-RS in downlink in the same subframe, transmission of
the SRS and reception of the CSI-RS is performed in the same
subframe. In this case, priories may be defined or may not be
defined between an SRS and a CSI-RS. Meanwhile, when an SRS is
assigned to the same symbol as that of a CSI-RS in the same
subframe, one of priorities of the SRS and CSI-RS is defined to be
higher. By this means, priority is given to processing of a signal
of a higher priority between the SRS and the CSI-RS.
[0061] An SRS in uplink is assigned to a different symbol from that
of a PBCH signal in downlink in the same subframe. Accordingly,
transmission of the SRS and reception of the PBCH signal is
performed in the same subframe. In addition, priories may be
defined or may not be defined between an SRS and a PBCH signal.
[0062] The priority of a PRACH signal in uplink is defined to be
lower than the priority of a PDSCH signal in downlink. Accordingly,
when transmission timing of the PRACH signal and reception timing
of the PDSCH signal overlaps each other, the mobile terminal
apparatus receives the PDSCH signal.
[0063] The priority of a PRACH signal in uplink is defined to be
higher than the priority of a PDCCH signal in downlink.
Accordingly, when transmission timing of the PRACH signal and
reception timing of the PDCCH signal overlaps each other, the
mobile terminal apparatus transmits the PRACH signal. In addition,
the mobile terminal apparatus may perform transmission of the PRACH
signal and reception of the PDCCH signal in the same subframe,
using a PRACH format for HD-FDD.
[0064] The priority of a PRACH signal in uplink is defined to be
lower than the priority of a PHICH signal in downlink. Accordingly,
when transmission timing of the PRACH signal and reception timing
of the PHICH signal overlaps each other, the mobile terminal
apparatus receives the PHICH signal. In addition, the mobile
terminal apparatus may perform transmission of the PRACH signal and
reception of the PHICH signal in the same subframe, using the PRACH
format for HD-FDD.
[0065] The priority of a PRACH signal in uplink is defined to be
higher than the priority of a CSI-RS in downlink. Accordingly, when
transmission timing of the PRACH signal and reception timing of the
CSI-RS overlaps each other, the mobile terminal apparatus transmits
the PRACH signal.
[0066] The priority of a PRACH signal in uplink is defined to be
higher than the priority of a PBCH signal in downlink. Accordingly,
when transmission timing of the PRACH signal and reception timing
of the PBCH signal overlaps each other, the mobile terminal
apparatus transmits the PRACH signal. In addition, the mobile
terminal apparatus may give a higher priority to reception of the
PBCH signal than transmission of the PRACH signal in a particular
subframe. The particular subframe may be notified by RRC signaling
or the like, or may be notified by adding a control bit of the
PDCCH signal.
[0067] By thus defining the priority relationship between an uplink
signal and a downlink signal, even when transmission timing of the
uplink signal and reception timing of the downlink signal overlaps
each other, it is possible to cause the mobile terminal apparatus
to perform transmission/reception processing of an important signal
with reliability. In addition, the priority relationship as
described above is defined while giving a higher priority mainly to
an uplink signal than a downlink signal, but is not limited
thereto. The priority relationship is capable of being modified as
appropriate corresponding to the network configuration, base
station apparatus configuration, mobile terminal apparatus
configuration and the like.
[0068] Transmission/reception methods of uplink signal and downlink
signal in the same subframe as described above will specifically be
described with reference to FIG. 5. FIG. 5 contains explanatory
views of transmission/reception methods of uplink signal and
downlink signal in the same subframe.
[0069] A first transmission/reception method as shown in FIG. 5A is
a transmission/reception method in which a mobile terminal
apparatus receives a downlink signal up to some point in a
subframe, and then, transmits an uplink signal in remaining
symbols. Herein, the description is given by exemplifying a PDCCH
signal and PDSCH signal as downlink signals, and an SRS as an
uplink signal, but is not limited to these signals, and it is
possible to modify as appropriate.
[0070] Generally, an uplink SRS is assigned to a different symbol
from that of a downlink PDCCH signal in the same subframe, but
overlaps a symbol assigned to part of a downlink PDSCH signal.
Therefore, as shown in FIG. 5A, the mobile terminal apparatus
ignores last several symbols (2 symbols in this Embodiment) of the
PDSCH signal for the SRS. The mobile terminal apparatus receives
the PDCCH signal of first 3 symbols from the base station
apparatus, while receiving the PDSCH signal up to symbols
two-symbol-before the last symbol. Subsequently, the mobile
terminal apparatus uses a symbol immediately before the last symbol
as a guard interval to switch from the downlink reception
processing to the uplink transmission processing, and transmits the
SRS to the base station apparatus in the last symbol.
[0071] Further, the base station apparatus may perform rate
matching processing or puncturing processing on a PDSCH signal to
transmit the PDSCH signal with two symbols being vacant
corresponding to an SRS and guard interval reserved in a single
subframe. In this case, the base station apparatus performs the
rate matching processing or the like of the PDSCH signal based on
the priority relationship defined between the uplink signal and the
downlink signal. The mobile terminal apparatus receives the PDCCH
signal and PDSCH signal from the base station apparatus.
Subsequently, the mobile terminal apparatus uses a symbol
immediately before the last symbol as a guard interval to switch
from the downlink reception processing to the uplink transmission
processing, and transmits the SRS to the base station apparatus in
the last symbol reserved for the SRS.
[0072] In addition, in the above-mentioned first
transmission/reception method, the downlink signal is received up
to some point, and then, the uplink signal is received in the
remaining symbols. Alternatively, the uplink signal may be
transmitted up to some point, and then, the downlink signal may be
received in the remaining symbols. Further, in FIG. 5A, it is
preferable that last two symbols of the PDSCH signal are not
assigned important data.
[0073] A second transmission/reception method as shown in FIGS. 5B
and 5C is a transmission/reception method for performing
transmission of an uplink signal and reception of a downlink signal
in the same subframe, using a signal format for HD-FDD in a single
subframe. Herein, the description is given by exemplifying a PDCCH
signal and PHICH signal that are downlink L1/L2 control signals as
downlink signals, and a PUCCH signal and PRACH signal as uplink
signals, but is not limited to these signals, and it is possible to
modify as appropriate.
[0074] Generally, a PUCCH signal in uplink is assigned to the
entire subframe, and therefore, overlaps symbols assigned to a
PDCCH signal and PHICH signal in downlink in the same subframe.
Therefore, as shown in FIG. 5B, the mobile terminal apparatus uses
a PUCCH format for HD-FDD in which first several symbols (4 symbols
in this Embodiment) of a PUCCH are punctured or undergo rate
matching so as to avoid a PDCCH signal and PHICH signal. The mobile
terminal apparatus receives the PDCCH signal and PHICH signal from
the base station apparatus in first 3 symbols of the PUCCH format
for HD-FDD undergoing puncturing or the like. Subsequently, the
mobile terminal apparatus uses a 4th symbol of the PUCCH format for
HD-FDD as a guard interval to switch from the downlink reception
processing to the uplink transmission processing, and transmits the
PUCCH signal to the base station apparatus in the remaining
symbols.
[0075] Further, generally, a PRACH signal in uplink is assigned to
the entire subframe, and therefore, overlaps symbols assigned to a
PDCCH signal and PHICH signal in downlink in the same subframe.
Therefore, as shown in FIG. 5C, the mobile terminal apparatus uses
a PRACH format for HD-FDD in which first several symbols (4 symbols
in this Embodiment) of a PRACH are punctured so as to avoid a PDCCH
signal and PHICH signal. The mobile terminal apparatus receives the
PDCCH signal and PHICH signal from the base station apparatus in
first 3 symbols of the PRACH format for HD-FDD undergoing
puncturing. Subsequently, the mobile terminal apparatus uses a 4th
symbol of the PRACH format for HD-FDD as a guard interval to switch
from the downlink reception processing to the uplink transmission
processing, and transmits the PRACH signal to the base station
apparatus in the remaining symbols.
[0076] Moreover, the base station apparatus may use an uplink
signal format for HD-FDD in which a part of symbols of an uplink
signal undergoes puncturing or rate matching so as to avoid a
downlink signal. The mobile terminal apparatus receives a PUSCH
signal of a part of the uplink signal format, while transmitting an
uplink signal in the remaining symbols.
[0077] In addition, in the above-mentioned second
transmission/reception method, a signal format for HD-FDD may be
used with first several symbols being vacant, or a signal format
for HD-FDD may be used with last several symbols being vacant or
middle several symbols being vacant. Further, an uplink signal
format and downlink signal format may be combined to use.
[0078] Moreover, the transmission/reception method of uplink signal
and downlink signal in the same subframe is not limited to the
first transmission/reception method and the second
transmission/reception method. Any method is capable of being used,
as long as the method enables the mobile terminal apparatus to
perform transmission processing of an uplink signal and reception
processing of a downlink signal in the same subframe.
[0079] A radio communication system according to the Embodiment of
the invention will specifically be described herein. FIG. 6 is an
explanatory view of a system configuration of the radio
communication system according to this Embodiment. In addition, the
radio communication system as shown in FIG. 6 is a system including
the LTE system or SUPER 3G, for example. Further, the radio
communication system may be called IMT-Advanced or may be called
4G.
[0080] As shown in FIG. 6, the radio communication system 1
includes the base station apparatus 20, and a plurality of mobile
terminal apparatuses 10 (10.sub.1, 10.sub.2, 10.sub.3, . . . ,
10.sub.n, n is an integer where n>0) that communicate with the
base station apparatus 20 and is comprised thereof. The base
station apparatus 20 is connected to an upper station apparatus 30,
and the upper station apparatus 30 is connected to a core network
40. The mobile terminal apparatuses 10 are capable of communicating
with the base station apparatus 20 in a cell 50. In addition, for
example, the upper station apparatus 30 includes an access gateway
apparatus, radio network controller (RNC), mobility management
entity (MME), etc., but is not limited thereto.
[0081] Each of the mobile terminal apparatuses (10.sub.1, 10.sub.2,
10.sub.3, . . . , 10.sub.n) includes an LTE terminal and LTE-A
terminal, and is described as a mobile terminal apparatus 10 unless
otherwise specified in the following description. Further, for
convenience in description, the description is given while assuming
that equipment that performs radio communications with the base
station apparatus 20 is the mobile terminal apparatus 10, and more
generally, the equipment may be user equipment (UE) including
mobile terminal apparatuses and fixed terminal apparatuses.
[0082] In the radio communication system 1, as a radio access
scheme, OFDMA (Orthogonal Frequency Division Multiple Access) is
applied in downlink, while SC-FDMA (Single-Carrier Frequency
Division Multiple Access) is applied in uplink, but the uplink
radio access scheme is not limited thereto. OFDMA is a multicarrier
transmission scheme for dividing a frequency band into a plurality
of narrow frequency bands (subcarriers), and mapping data to each
subcarrier to perform communications. SC-FDMA is a single-carrier
transmission scheme for dividing the system band into bands
comprised of a single or consecutive resource blocks for each
terminal so that a plurality of terminals uses mutually different
bands, and thereby reducing interference among the terminals.
[0083] Referring to FIG. 7, described is the entire configuration
of the base station apparatus 20 according to this Embodiment. The
base station apparatus 20 is provided with a transmission/reception
antenna 201, transmission/reception section 203, baseband signal
processing section 204, call processing section 205 and
transmission path interface 206. The user data to transmit from the
base station apparatus 20 to the mobile terminal apparatus 10 in
downlink is input to the baseband signal processing section 204 via
the transmission path interface 206 from the upper station
apparatus 30.
[0084] The baseband signal processing section 204 performs PDCP
layer processing, segmentation and concatenation of the user data,
RLC (Radio Link Control) layer transmission processing such as
transmission processing of RLC retransmission control, MAC (Medium
Access Control) retransmission control e.g. HARQ transmission
processing, scheduling, transmission format selection, channel
coding, Inverse Fast Fourier Transform processing and precoding
processing. Further, on a signal of the Physical Downlink Control
Channel that is a downlink control channel, the section 204 also
performs transmission processing of channel coding, Inverse Fast
Fourier Transform and the like.
[0085] Further, the baseband signal processing section 204 notifies
the mobile terminal apparatus 10 of control information for
communications in the cell on the broadcast channel. For example,
the control information includes the system bandwidth in uplink or
downlink, identification information (Root Sequence Index) of a
root sequence to generate a signal of a random access preamble on
the PRACH, etc.
[0086] The transmission/reception section 203 converts the
frequency of the baseband signal output from the baseband signal
processing section 204 into a radio frequency band, and amplifies
the signal to output to the transmission/reception antenna 201.
[0087] Meanwhile, with respect to signals transmitted from the
mobile terminal apparatus 10 to the base station apparatus 20 in
uplink, a radio frequency signal received in the
transmission/reception antenna 201 is amplified in the
transmission/reception section 203, while being converted into a
baseband signal, and is input to the baseband signal processing
section 204.
[0088] The baseband signal processing section 204 performs FFT
processing, IDFT processing, error correcting decoding, reception
processing of MAC retransmission control, and reception processing
of RLC layer and PDCP layer on the user data included in the
baseband signal received in uplink. The decoded signal is
transferred to the upper station apparatus 30 via the transmission
path interface 206.
[0089] The call processing section 205 performs call processing
such as setting and release of the communication channel, status
management of the base station apparatus 20, and management of
radio resources.
[0090] Referring to FIG. 8, described next is the entire
configuration of the mobile terminal apparatus 10 according to this
Embodiment. The LTE terminal and the LTE-A terminal have the same
configuration of principal part of hardware, and are not
distinguished to describe. The mobile terminal apparatus 10 is
provided with a transmission/reception antenna 101,
transmission/reception section 103, baseband signal processing
section 104 and application section 105.
[0091] With respect to data in downlink, a radio frequency signal
received in the transmission/reception antenna 101 is amplified in
the transmission/reception section 103, while being subjected to
frequency conversion, and is converted into a baseband signal. The
baseband signal is subjected to FFT processing, error correcting
decoding, reception processing of retransmission control, etc. in
the baseband signal processing section 104. Among the data in
downlink, the user data in downlink is transferred to the
application section 105. The application section 105 performs
processing concerning layers higher than the physical layer and MAC
layer and the like. Further, among the data in downlink, the
broadcast information is also transferred to the application
section 105.
[0092] Meanwhile, with respect to user data in uplink, the
application section 105 inputs the data to the baseband signal
processing section 104. The baseband signal processing section 104
performs transmission processing of retransmission control (HARQ),
channel coding, DFT processing and IFFT processing. The
transmission/reception section 103 converts the frequency of the
baseband signal output from the baseband signal processing section
104 into a radio frequency band, and amplifies the signal to output
to the transmission/reception antenna 101.
[0093] Functional blocks of the base station apparatus according to
this Embodiment will be described with reference to FIG. 9. In
addition, FIG. 9 mainly shows functional blocks of the baseband
processing section and transmission/reception section. Further,
FIG. 9 simplifies the baseband processing section and
transmission/reception section, and it is assumed to have
configurations generally provided in the baseband processing
section and transmission/reception section. The base station
apparatus 20 has a PBCH signal generating section 211, PDCCH signal
generating section 212, PHICH signal generating section 213, PDSCH
signal generating section 214, CSI-RS generating section 215,
physical channel multiplexing section 216, IFFT section 217, CP
adding section 218, and transmission RF circuit 203b, as a
transmission system.
[0094] The PBCH signal generating section 211 generates a PBCH
signal including basic parameters of a bandwidth, control channel
configuration, etc. The PDCCH signal generating section 212
generates a PDCCH signal including format information such as a
modulation method and coding rate, in addition to scheduling
information of the PUSCH signal and PDSCH signal, for each user,
based on allocation by a scheduler 231. The PHICH signal generating
section 213 generates a PHICH signal for HARQ (Hybrid Automatic
Repeat reQuest) to the PUSCH signal based on allocation by the
scheduler 231. The PDSCH signal generating section 214 generates a
PDSCH signal including user data and control information of a
higher layer shared by a plurality of mobile terminal apparatuses
10, based on allocation by the scheduler 231. The CSI-RS generating
section 215 generates a CSI-RS used only for measurement of channel
state information.
[0095] The physical channel multiplexing section 216 multiplexes
downlink signals which are coded and modulated in respective signal
generating sections to input to the IFFT section 217. The IFFT
section 217 performs IFFT (Inverse Fast Fourier Transform) on the
multiplexed downlink signal, and transforms the signal in the
frequency domain into a time-series signal. The CP adding section
218 inserts a cyclic prefix in the downlink signal. Then, the
downlink signal passes through the transmission RF circuit 203b,
and is transmitted from the transmission/reception antenna 201 via
a duplexer 203c provided in between the transmission system and a
reception system.
[0096] As the reception system, the base station apparatus 20 has a
PUSCH signal demodulation .cndot. decoding section 221, PUCCH
signal demodulation .cndot. decoding section 222, PRACH signal
reception section 223, SRS reception section 224, physical channel
dividing section 225, FFT section 226, CP removing section 227 and
reception RF circuit 203a. An uplink signal received in the
transmission/reception antenna 201 is input to the CP removing
section 227 via the duplexer 203c and reception RF circuit 203a.
The CP removing section 227 removes the cyclic prefix from the
uplink signal to input to the FFT section 226. The FFT section 226
performs Fast Fourier Transform (FFT) on the uplink signal, and
transforms the time-series signal into a signal in the frequency
domain to input to the physical channel dividing section 225. The
physical channel dividing section 225 divides uplink signals
multiplexed into the uplink signal into respective signals.
[0097] The PUSCH signal demodulation .cndot. decoding section 221
demodulates a PUSCH signal including user data and control
information of a higher layer shared by a plurality of mobile
terminal apparatuses 10, based on allocation by the scheduler 231,
and further decodes the signal. The PUCCH signal demodulation
.cndot. decoding section 222 demodulates a PUCCH signal including a
Periodic CQI, ACK/NACK to the PDSCH and Positive SR, based on
allocation of the scheduler 231, and further decodes the signal.
The PRACH signal reception section 223 receives a collision type
PRACH signal used in initial access of the mobile terminal
apparatus 10. The SRS reception section 224 receives an SRS to
perform scheduling by the scheduler 231 and adaptive control.
[0098] The scheduler 231 controls resource allocation to mobile
terminal apparatuses 10 under the base station apparatus
corresponding to communication quality of the entire system band.
The scheduler 231 distinguishes between an LTE terminal user and an
LTE-A terminal user to perform scheduling. To the scheduler 231 are
input transmission data and retransmission instructions from the
upper station apparatus 30, and a channel estimation value and CQI
of a resource block from the reception section that measures the
uplink signal. The scheduler 231 performs scheduling of the PDCCH
signal, PHICH signal and PDSCH signal, while referring to the
retransmission instructions input from the upper station apparatus
30, channel estimation value and CQI. In a propagation path in
mobile communications, variations vary with frequencies by
frequency selective fading. Then, in transmitting user data to
mobile terminal apparatuses 10, the scheduler 231 allocates
resource blocks with good communication quality for each subframe
to each mobile terminal apparatus 10 (called adaptive frequency
scheduling). In adaptive frequency scheduling, a mobile terminal
apparatus 10 of good propagation path quality is selected and
allocated for each resource block. Therefore, the scheduler 231
uses CQIs on a basis of a resource block transmitted from each
mobile terminal apparatus 10 as feedback to allocate resource
blocks. Further, the scheduler 231 determines an MCS (coding rate,
modulation scheme) meeting a predetermined block error rate in the
allocated resource block. A parameter satisfying the MCS determined
in the scheduler 231 is set on the PDCCH signal generating section
212, PHICH signal generating section 213 and PDSCH signal
generating section 214.
[0099] Further, the scheduler 231 controls demodulation and
decoding of the PUSCH signal demodulation .cndot. decoding section
221 and PUCCH signal demodulation .cndot. decoding section 222, in
consideration of the above-mentioned priority relationship. When
transmission and reception timing of uplink and downlink signals in
the mobile terminal apparatus 10 overlaps each other, the PUSCH
signal demodulation .cndot. decoding section 221 and PUCCH signal
demodulation .cndot. decoding section 222 need to determine whether
the uplink signal is transmitted to the base station apparatus 20.
Therefore, the scheduler 231 inputs, to the PUSCH signal
demodulation .cndot. decoding section 221 and PUCCH signal
demodulation .cndot. decoding section 222, which transmission of
the uplink signal or reception of the downlink signal is given a
higher priority in the mobile terminal apparatus 10 in a
predetermined subframe based on the above-mentioned priority
relationship.
[0100] Furthermore, the base station apparatus 20 has a signal
format selecting section 232. When uplink and downlink signals are
received and transmitted in the same subframe, the signal format
selecting section 232 selects the signal format as shown in FIGS.
5A to 5C, based on allocation by the scheduler 231. When the
transmission/reception method in the same subframe is controlled on
the base station apparatus 20 side, the signal format selecting
section 232 inputs signal format information to the signal
generating sections. For example, based on the signal format
information, on the premise that the mobile terminal apparatus 10
does not receive last several symbols of the subframe as shown in
FIG. 5A, the PDSCH signal generating section 214 may perform rate
matching processing or puncturing processing on the PDSCH signal.
Further, for example, the PDSCH signal generating section 214 may
generate the PDSCH format for HD-FDD in which the PDSCH signal
undergoes rate matching or puncturing so as to avoid the downlink
signal, based on the signal format information.
[0101] Meanwhile, when the transmission/reception method in the
same subframe is controlled on the mobile terminal apparatus 10
side, the signal format selecting section inputs the signal format
information to the demodulation .cndot. decoding sections and
reception sections. By this means, even when transmission and
reception timing of downlink and uplink signals overlaps each other
in the same subframe, the demodulation .cndot. decoding sections
and reception sections are capable of recognizing symbols in which
an uplink signal is transmitted. For example, the PUCCH signal
demodulation .cndot. decoding section 222 recognizes symbols
assigned a PUCCH signal in a single subframe based on the signal
format information, demodulates the PUCCH signal, and further
decodes the signal.
[0102] Functional blocks of the mobile terminal apparatus according
to this Embodiment will be described with reference to FIG. 10. In
addition, FIG. 10 mainly shows functional blocks of the baseband
processing section and transmission/reception section. Further,
FIG. 10 simplifies the baseband processing section and
transmission/reception section, and it is assumed to have
configurations generally provided in the baseband processing
section and transmission/reception section. The mobile terminal
apparatus 10 has a PUSCH signal generating section 111, PUCCH
signal generating section 112, PRACH signal generating section 113,
SRS generating section 114, physical channel multiplexing section
115, IFFT section 116, CP adding section 117, and transmission RF
circuit 103b, as a transmission system.
[0103] The PUSCH signal generating section 111 generates a PUSCH
signal shared among a plurality of mobile terminal apparatuses 10
based on scheduling information. The PUCCH signal generating
section 112 generates a PUCCH signal including a Periodic CQI,
ACK/NACK, and Positive SR. The PRACH signal generating section 113
generates a collision type PRACH signal used in initial access to
the base station apparatus 20. The SRS generating section 114
generates an SRS used in scheduling and adaptive control.
[0104] The physical channel multiplexing section 115 multiplexes
uplink signals which are coded and modulated in respective signal
generating sections to input to the IFFT section 116. The IFFT
section 116 performs IFFT (Inverse Fast Fourier Transform) on the
multiplexed uplink signal, and transforms the signal in the
frequency domain into a time-series signal. The CP adding section
117 inserts a cyclic prefix in the uplink signal. Then, the uplink
signal passes through the transmission RF circuit 103b, and is
transmitted from the transmission/reception antenna 101 via a
switch 103c provided in between the transmission system and a
reception system.
[0105] As the reception system, the base station apparatus 20 has a
PBCH signal demodulation .cndot. decoding section 121, PDCCH signal
demodulation .cndot. decoding section 122, PHICH signal
demodulation .cndot. decoding section 123, PDSCH signal
demodulation .cndot. decoding section 124, CSI-RS reception section
125, physical channel dividing section 126, FFT section 127, CP
removing section 128 and reception RF circuit 103a. A downlink
signal received in the transmission/reception antenna 101 is input
to the CP removing section 128 via the switch 103c and reception RF
circuit 103a. The CP removing section 128 removes the cyclic prefix
from the downlink signal to input to the FFT section 127. The FFT
section 127 performs Fast Fourier Transform (FFT) on the downlink
signal, and transforms the time-series signal into a signal in the
frequency domain to input to the physical channel dividing section
126. The physical channel dividing section 126 divides downlink
signals multiplexed into the downlink signal into respective
signals.
[0106] The PBCH signal demodulation .cndot. decoding section 121
demodulates a PBCH signal including system information specific to
the cell, and further decodes the signal. The PDCCH signal
demodulation .cndot. decoding section 122 demodulates a PDCCH
signal including scheduling information of a PUSCH signal and PDSCH
signal for each user, and further decodes the signal. The PDCCH
signal demodulation .cndot. decoding section 122 inputs scheduling
information of uplink and downlink to a transmission/reception
channel .cndot. signal format selecting section 131. The PHICH
signal demodulation .cndot. decoding section 123 demodulates a
PHICH signal to the PUSCH, and further decodes the signal. The
PHICH signal demodulation .cndot. decoding section 123 inputs
whether or not to retransmit the PUSCH to the
transmission/reception channel .cndot. signal format selecting
section 131 based on the PHICH signal. The PDSCH signal
demodulation .cndot. decoding section demodulates a PDSCH signal
including user data and control information of a higher layer
shared among a plurality of mobile terminal apparatuses 10, and
further decodes the signal. The CSI-RS reception section 125
demodulates a CSI-RS used only for measurement of channel state
information, and further decodes the signal.
[0107] Further, the mobile terminal apparatus 10 has the
transmission/reception channel .cndot. signal format selecting
section 131. The transmission/reception channel .cndot. signal
format selecting section 131 determines a signal of a higher
priority based on the priority relationship between uplink and
downlink signals when transmission and reception timing of uplink
and downlink signals overlaps each other. Then, based on the
determination result, the transmission/reception channel .cndot.
signal format selecting section 131 selects transmission processing
of the uplink signal or reception processing of the downlink signal
to give priority. More specifically, when the transmission
processing of the uplink signal is given priority, the
transmission/reception channel .cndot. signal format selecting
section 131 switches the switch 103c to the transmission system
side with switch timing information. By this means, the mobile
terminal apparatus 10 transmits the uplink signal via the
transmission/reception antenna 101. When the reception processing
of the downlink signal is given priority, the
transmission/reception channel .cndot. signal format selecting
section 131 switches the switch to the reception system side with
the switch timing information. By this means, the mobile terminal
apparatus 10 receives the downlink signal via the
transmission/reception antenna 101.
[0108] In this case, the transmission/reception channel .cndot.
signal format selecting section 131 may switch the switch 103c
contrary to the priority relationship in a particular subframe
notified by RRC signaling or PDCCH signal. In other words, in the
particular subframe, the section 131 may give priority to reception
processing of the downlink signal of a lower priority than the
uplink signal, or may give priority to transmission processing of
the uplink signal of a lower priority than the downlink signal.
Further, when neither transmission processing of the uplink signal
nor reception processing of the downlink signal is performed, the
transmission/reception channel .cndot. signal format selecting
section 131 separates the switch 103c from the transmission system
and reception system with the switch timing information. By this
means, the mobile terminal apparatus 10 halts the transmission and
reception processing of uplink signal and downlink signal.
[0109] Further, when uplink and downlink signals are transmitted
and received in the same subframe, the transmission/reception
channel .cndot. signal format selecting section 131 selects the
signal format shown in any of FIGS. 5A to 5C. When the
transmission/reception method in the same subframe is controlled on
the mobile terminal apparatus 10 side, the transmission/reception
channel .cndot. signal format selecting section 131 inputs the
signal format information to each signal generating section, each
demodulation .cndot. decoding section and reception section.
[0110] For example, in the first transmission/reception method as
shown in FIG. 5A, the PDSCH signal demodulation .cndot. decoding
section 124 demodulates the PDSCH signal while leaving last several
symbols based on the signal format information, and further decodes
the signal. Further, the SRS generating section 114 generates an
SRS in accordance with the last symbol. Meanwhile, in the second
transmission/reception method as shown in FIG. 5B, the PUCCH signal
generating section 112 selects the PUCCH format for HD-FDD based on
the signal format information, and performs puncturing or rate
matching on first several symbols to generate a PUCCH signal.
Further, the PDCCH signal demodulation .cndot. decoding section 122
and PHICH signal demodulation .cndot. decoding section 123
demodulate the PDCCH signal and PHICH signal assigned to first
several symbols based on the signal format information, and further
decode the signals. Moreover, in the second transmission/reception
method as shown in FIG. 5C, the PRACH signal generating section 113
selects the PRACH format for HD-FDD based on the signal format
information, and performs puncturing on first several symbols to
generate a PRACH signal. Further, the PDCCH signal demodulation
.cndot. decoding section 122 and PHICH signal demodulation .cndot.
decoding section 123 demodulate the PDCCH signal and PHICH signal
assigned to first several symbols based on the signal format
information, and further decode the signals.
[0111] In the transmission/reception in the same subframe, the
transmission/reception channel .cndot. signal format selecting
section 131 inputs the switch timing information to the switch 103c
at a guard interval provided in the subframe. By this means,
transmission of the uplink signal and reception of the downlink
signal is switched in a single subframe.
[0112] As described above, according to the mobile terminal
apparatus 10 according to this Embodiment, when transmission timing
of an uplink signal and reception timing of a downlink signal
overlaps each other in the mobile terminal apparatus,
transmission/reception processing is performed selectively.
Accordingly, for the mobile terminal apparatus 10 to which is
applied HD-FDD, it is possible to cause the apparatus 10 to perform
optimal operation when transmission timing of an uplink signal and
reception timing of a downlink signal overlaps each other.
[0113] In addition, in the above-mentioned Embodiment, indication
of a particular subframe is notified to the mobile terminal
apparatus by RRC signaling or adding a control bit to the PDCCH
signal, but is not limited thereto. The indication may be notified
by any method, when the method enables the mobile terminal
apparatus to be notified of the particular subframe.
[0114] Further, in the above-mentioned Embodiment, the priority
relationship is set on the base station apparatus and the mobile
terminal apparatus, and only the mobile terminal apparatus may be
set for the priority relationship. Moreover, the priority
relationship may be beforehand set on both the base station
apparatus and the mobile terminal apparatus, may be notified from
the base station apparatus to the mobile terminal apparatus, or may
be notified from the mobile terminal apparatus to the base station
apparatus.
[0115] The present invention is not limited to the above-mentioned
Embodiment, and is capable of being carried into practice with
various modifications thereof. For example, without departing from
the scope of the invention, kinds of uplink signals, kinds of
downlink signals, assignment positions of an uplink signal and
downlink signal, the number of functional blocks, processing
procedures and the like in the above-mentioned description are
capable of being carried into practice with modifications thereof
as appropriate. Further, the invention is capable of being carried
into practice with modifications thereof as appropriate without
departing from the scope of the invention.
[0116] The present application is based on Japanese Patent
Application No. 2011-033388 filed on Feb. 18, 2011, entire content
of which is expressly incorporated by reference herein.
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